<?php

/*
 * This file is part of SwiftMailer. (c) 2004-2009 Chris Corbyn For the full copyright and license information, please view the LICENSE file that was distributed with this source code.
 */

/**
 * Allows StreamFilters to operate on a stream.
 * 
 * @package Swift
 * @author Chris Corbyn
 */
interface Swift_Filterable {
	/**
	 * Add a new StreamFilter, referenced by $key.
	 * 
	 * @param Swift_StreamFilter $filter        	
	 * @param string $key        	
	 */
	public function addFilter(Swift_StreamFilter $filter, $key);
	
	/**
	 * Remove an existing filter using $key.
	 * 
	 * @param string $key        	
	 */
	public function removeFilter($key);
}
